fix: Only one ldflags flag is allowed

Makefile

@@ -1,9 +1,9 @@
 .PHONY: build test unittest lint clean update fmt docker run
 
 # change the following boolean flag to enable or disable the Full RELRO (RELocation Read Only) for linux ELF (Executable and Linkable Format) binaries
-ENABLE_FULL_RELRO:="true"
+ENABLE_FULL_RELRO=true
 # change the following boolean flag to enable or disable PIE for linux binaries which is needed for ASLR (Address Space Layout Randomization) on Linux, the ASLR support on Windows is enabled by default
-ENABLE_PIE:="true"
+ENABLE_PIE=true
 
 ARCH=$(shell uname -m)
 
@@ -18,16 +18,16 @@ GIT_SHA=$(shell git rev-parse HEAD)
 # with the SDK and printing just the version number that comes after it.
 SDKVERSION=$(shell sed -En 's|.*github.com/edgexfoundry/app-functions-sdk-go/v3 (v[\.0-9a-zA-Z-]+).*|\1|p' go.mod)
 
+ifeq ($(ENABLE_FULL_RELRO), true)
+	ENABLE_FULL_RELRO_GOFLAGS = -bindnow
+endif
+
 GOFLAGS=-ldflags "-s -w -X github.com/edgexfoundry/app-functions-sdk-go/v3/internal.SDKVersion=$(SDKVERSION) \
 					-X github.com/edgexfoundry/app-functions-sdk-go/v3/internal.ApplicationVersion=$(APPVERSION) \
-					-X edgexfoundry/app-rfid-llrp-inventory.Version=$(APPVERSION)" -trimpath -mod=readonly
+					-X edgexfoundry/app-rfid-llrp-inventory.Version=$(APPVERSION) $(ENABLE_FULL_RELRO_GOFLAGS)" -trimpath -mod=readonly
 GOTESTFLAGS?=-race
 
-ifeq ($(ENABLE_FULL_RELRO), "true")
-	GOFLAGS += -ldflags "-bindnow"
-endif
-
-ifeq ($(ENABLE_PIE), "true")
+ifeq ($(ENABLE_PIE), true)
 	GOFLAGS += -buildmode=pie
 endif